I don't quite follow? how would you "probe" ? for example, there is DDN array which write well with 1MB aligned/sized requests only. thus, mballoc tries to align allocation requests WRT to this constrain. do you mean incorporation storage benchmark in the mount procedure? thanks, Alex Eric wrote:
That hadn't occurred to me. Perhaps the filesystem driver or mkfs could probe for the stride in those cases? If the code asks for, say, 10MiB of data from the block device and it gets back sectors that are spaced 128KiB apart before it gets the rest of the data, it can make an intelligent guess about the stride. I wonder what penalties would come from a bad guess due to a cache in between the block device driver and the disk platters, or other load on a SAN... Eric
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